“[Nick Brown] went back over Losada’s equations and he noticed that if he put in the numbers Fredrickson and Losada had then you could arrive at the appropriate figures. But he realised that it only worked on its own terms. ‘When you look at the equation, it doesn’t contain any data. It’s completely self-referential.'”

Positive Psychology should stick with the business-lecture circuit and stay out of the stats & measurement trenches if it wants to “flourish” instead of “languish.”